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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1736cac6034ef674dca7ef3097d9ad01003d05504a19f15cbadf08b396b544f3' 
  AND token = '81PoO8BE31huYBEktLOff5jjffCaxeeY5INzbX+2sX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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