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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78bd659decb9f7e8c50117d4355112c55a451e1c8b87d25b489a5d17214242a' 
  AND token = 'mu29i85RVQZ5lXkCCEJYrbVWJJba9Ki2YPY4DwuBUjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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