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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedc4d95d3f44ec75afa9e7f0f1b6b7ae1282574fc928b4207576fd95585d884' 
  AND token = 'gaPutNUrhotVCHb6On96lthdKfphXxBOpwYFHdT3z1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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