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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15f7a44fc57d7c1f6aeff83c1257ceb60c8fdaca5e34d63f490d6b4aae85f51' 
  AND token = '742/yqMHwqHcQdNAfajnxgwWMOQqEwD0b0AT4l0kDLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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