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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0f4c825b77eb0a1b721fde4cc6c22ecae7515a6868268cd3343189d8a12e6a' 
  AND token = '6YkAck/QOjQTcKcLwYs3qlXXqLaEKGS0z/W1Oz3UClk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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