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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7052c550dfab3c0aa86539c529acbf298e8b7e95b5b0c8be7fd2bea3e47f66' 
  AND token = 'fyhnjoWE3de47gpT2sEY20IV2RQagOEboy14IoaeXLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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