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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9556b483ce3997c3e16bbcdf16473bab5cc9c7e27a23891e81def55bbe49c5' 
  AND token = '+iBiLRt/eYI6C7S9x5YdTalik0pEQJldFIgYWYy3UJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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