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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43dc16ecd2725fdbce7486aef9b723b1f38d25c4bdba327a1cff11d77a07570b' 
  AND token = '0TKYT5LKFExaMcr8me485SZf42Qoi8tY0DQuN0pSsNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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