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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdccfcdc38d5e0ca28b264a02c20510bc3b59d0d613c7ac05c62582f0c2e6896' 
  AND token = '793iqcJNh11KFpFJkw0EonqDVjiUxXGwT7dyo/HnuHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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