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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6379098de3da4ab4db95915b51a710c0dc4411bfabe24fb0f747f3ae3e5a52b2' 
  AND token = 'W+utPOGYgNQbnBsl1TNqy/UCGf3ml4mc68N5DNpQ548=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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