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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5929f25379b80f2d77d51a58c95e1b967345cc2620f5fcfedc9b8d3c53d77668' 
  AND token = 'hThvte5egEVCF/RfItm/iq2NRytOmeGTDmbdOZFFQMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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