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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce520c03b3e9b01667dec01abce75bf830552063a8c1628975a46ee2ad53c79' 
  AND token = 'x+R2HRtFBX+CdT4JhlQZal69usMM41+hQOuzSHHdyms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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