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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1681f985b3ad37e2543d48303295b386c576949ce23e4db236247fe737ca18' 
  AND token = 'dbG2VkSQgrmHEF1Nox2kO8VgFYLPDm0URwiZ7BTM1HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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