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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8751eadb355a3ee3b12ee7a5dde24a2c4838fc839b4054272e1a092817a8dc6b' 
  AND token = '4psQoS/kHb3hx5BYHGy2hAQO/cb5F1nAstt7+RCGNg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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