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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75297ee14e4388a7a69a320ee0b31bf469f0d27dbd8cae0872b5f784f6e4fe9e' 
  AND token = 'OOg6N44EKp1qyos50n3PCdex36jU+IXEHi0pO1cS4Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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