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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5c7b84e49a833fd5253f2426aa8a9839b576d34aa906672a8fa84dfca0290e' 
  AND token = 'Sn40KvEu76zSI5BVxKSH4aJYn/ZTuXRuXrc3L1hIhlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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