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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c13aa97e8283838604538eb0cfee71ce2a09e0f611dcf058219c943f11a1fd' 
  AND token = '/qguxZB5QmGMrFCKhhIQ9Pe5p0OklWj7DEX+5i5l3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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