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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f9d1549e2867530c3f514389b9236240bbe4da2e3732853116ac3704e2cb74' 
  AND token = 'wQfCfLny0IL2HOjfErVoD9v0G5kM38NOw+VoJDyY7tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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