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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9102f5d30f0f95ee1ca3dc97966a9a5d5c0c4b37a5ec6781e5e2a1b57faebd19' 
  AND token = '+fqLW94mvogzD8HM4tFYav4V+Hmnj/Ck/YSNDxyBFl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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