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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfbc6aee93d40fdf6ce40af76a78ac06503eabb6ec26fd13c7081329b59bf71' 
  AND token = 'FPX4xlRUEBbfQ69KClGctpWb/5rpU2c6Z5+LWZOTtX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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