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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6050c249c667e7b713f3a281668ced28ed99b012e1841bfa7f9e6eb76c2f0c' 
  AND token = 'TKH9bG4u+z97YHpbmYvzOg/25OcYe7GhxpSzz5UChTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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