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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fc130a073aa558413e97edaaa8a0cb8d03036385d2dae85f49beab4a3bb4c9' 
  AND token = 'dHr0ip6Pr9dnX2WhMV9NIrLEVhn4MagLmHerVQGVrk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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