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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aff851c0ac56f65e0480912741f1daa5065c882ee6f5623310e6f2c876e1d98' 
  AND token = 'Yq04jIWABJdFt0HThi/4A12fSu7JWaL0bYRYihmLSao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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