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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a472a81a1f03fdf6bde72b5ec1ae78bb68f89376a2cb4fae991044495a2f6d3' 
  AND token = 'RFghdc48tLZANELijbf3chSUI4IKa+L7eAodBuE7Avw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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