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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217f96c06fe4df25713c537bb8d866963bbf8053bf09c7c2d3598c0100f0d3a5' 
  AND token = 'W3SSNQaXHs4DEOj+FOM/oLHyh15VY7eX771d3dHBU8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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