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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a0628b7642de9097483f3c84684e037e323659992a776b45a3a090c8f44226' 
  AND token = '+ps+xVJwtuPtqiK9KPa66k0gTfvSlWZ1l629TzE36jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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