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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093c0578102c18a8cb04114d9f00470d8d56a22a600b53b51abfa159b5bfa716' 
  AND token = 'f4+TV5PzWN1nANO3rjYCUhldRsze7z53exAI/leciA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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