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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1672c9cb647cecd3c2332bc6bad118583189d3fe7a22babb8dbbb89e0ecda0' 
  AND token = '4ZFbk4RMtqEXfG4YKeFKaHAacK8RzfBeSHN9v4hJ+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}