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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852350d7833b6891ce875993344d1ccfa30b05078bf073232a0e835a483587c5' 
  AND token = 'wbIwu/5astB0roLr2M+9/6IsAA71PD7MsedlS1rdeEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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