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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f09c327b0c8284793181218e6c5e7f69d5b3b7e042f514aaae2354c65b8aa4' 
  AND token = 'WmyzSN4mrXyCE59krACJxJZZlt+lrDVofpMp2cVGq4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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