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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8618601f24e70bd991cb33bdd540c160a7d75d5cdb06f315070667b4f87f07e' 
  AND token = 'Da0shkjieRDq+GUcWSrDzc9vfTl9kKeI0nnoPWSy6RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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