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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bc529ad23e6fbe01da928a4adf96e3a1226dc80d21b4633193e2f3d10d0672' 
  AND token = 'QPNZQpp9IB3eeepsdkBLUUZuZCEqagh50XJa9LPwRB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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