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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96caa0f8515a1bf849eda505ccbf1f8ecbe2ec8027a20b6b2aaaf319f7736b14' 
  AND token = 'i6jHi8tXYuy07aE5YV1khj/+cXWUd4Xzwb9xlj+O9gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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