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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bcbd6c82991f7ca557690e0446976af9b4b53c95379aadbb90f5b1b7e92dd8' 
  AND token = '5RyJhhKeliMo6XVhtkEqN3Pr0L4gQm47qd7bu5Yb0nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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