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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7931788bb178af251cce10ca6cfbd92a1d91beff060e9061660bdb53b2b90bb5' 
  AND token = 'UVzRR21vzUn3ntrN4ybLRW6UlDUqMoUt24o1nZ6074s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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