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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7316fb4644a7383fb568b5aa291c8fc11faed2289651c648f485fb71c9747a18' 
  AND token = '7crTao2VDy0qGZSf6+Op+75Z4eGcH0C4MhJ1dRAVzRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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