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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a49df72592cf152b95df0b3c15e5ef6ffab6baff0b1ca7f6f8c4d64b1a28213' 
  AND token = 'w7Is1wu1PF3vPqye210neh3Uxp/SVEPzhlTcUrtu8s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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