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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67dff6bf2c22df2df8db748b3d5711c1807bd42e5bcc481148614e3c63ece7e' 
  AND token = 'x83zKBrL3PJRcYU0aQDjbK1JloDjzp6dAqbR3woXnDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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