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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809faaac1fce83d95350cfb4b899f89bb9a1704a016973b192b05974ae2eedcb' 
  AND token = 'pI3SuJ7zpNKrs9AHbiC9SdL4MRFAy0o2Ho2hTlCSbe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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