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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11240a83b2a970a0d20967c3c605c25d247654ac47b9b224e4a25a2a67ad992c' 
  AND token = 'xpP9rX89NkBnvaEWIWDcr11XK80uLib14Rj3BvmLrDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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