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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad1ba880d5981cef9d3aedd33402e3fde99fa35be63da2c8bfd19365c36a864' 
  AND token = 'IJfnPt7A2qYiNSea3yLhD9DWdpn+652f58p9tVUuY3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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