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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5cb6f32a2e1f21d1f27a749638e25205513267fa936cf08a1fe64499250477' 
  AND token = '9PlJ3bAcCzeJTym5OE5JYB9WCGuzd+Acb3miCFqjL10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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