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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85bfab2a9bd4e4cfe62b605aa276aa3a46669f63968c0f7eeabfe2c10e4e37a' 
  AND token = 'Msbk31zEQO0dvVIot8VY0pi59oHK9VO4apjfsKg0nLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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