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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008332b265a67977af80a191d1ff0fe0ba710ad817618c58fac4f4847b913ecb' 
  AND token = 'NXzyoN59I32MirpuCIqYSNgGw3+HGf39ZH0+9ddCAJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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