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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d62ff15056cbf2cef8511d8bd403d347096e545feb2d66293e9c945742e2c1a' 
  AND token = 'hq7BH65sy6QAv/e4UuqhENeyblyvnodKnl+uciENFPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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