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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1eb651ff0de4bafe847cafa5c6c6bde376c282b0d286d2fcc4b862db2a75e8e' 
  AND token = 'AlqT77bdW+i5+xWKeJqCVVJlxCqFbonHXaXdrsXp5Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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