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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b65b778ca09fb06ed83f96c3ddcec56b1a86f670eeca792d52f78b8cdf12d3' 
  AND token = '1IokkXQJ8lf0lNULJf5BYf9phkza+gJsG5l1DOW6Ni8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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