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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0a248892522fc7f317d5cb413b13efadb6c7f0fd1f4fb7c98f8ab50f127b02' 
  AND token = '6uYKhfyY5N3WIsl9ZcuzqXmIwycPOHPv88guBarNUas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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