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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4c02d7acfa6292b7b9cd3ec07aab6ff80b9c0f66a3b0cc5e2307f8143175cc' 
  AND token = 'CAP7KmxAELEm3f5MWM8rEr3j4XmH2nVFBRk9D0snZPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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