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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0948e318e0067e27cf6df878c6b580e3ef265d2113e811e57fa7b9d1d710c5d' 
  AND token = 'fDnlaHv6K/LT5xImlrfxd3JoPllxpMo+1SpxhAiL4MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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