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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd055bcb68aaa92686df2b92228290b42901491b065fae4c32ed8c76e5423b557' 
  AND token = 'kAlzTo+F1gT/tCVvXZR+9cw6dGW4SQIZ2olitMEmZsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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