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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3c927cecab93e61ece99f10e24274ce237310d2fdf40c7a1b45cdd80cd091d' 
  AND token = 'Dnj5Sap3LWR9JTI67DbcyQOMIPLJ8T14SiUNWyhkJts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00258

JSON explain

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