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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be350e46d265cabb5179a65a761d0e9d8ce40fa6ad60f646a8d4afa48c4e042a' 
  AND token = '6+z3xJQ7bIO5Jit3c8SmSaax9X5B5j4X4UTQOI0j0hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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