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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77e8ac18bf60ddd9044ff71638f152ba75c13533faa25548873ff23feb7576c' 
  AND token = 'Hv7Fom7Ev3knTOi4jU70g9os7ItpoIX+kToq3+Ct/JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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