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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ff7d0b9c122801ccdee1aef2b8ca5528dcd121e342718f643b268bf7dda3ed' 
  AND token = 'qNlB+2lJp7XGK9uDKUP4ibnF4Fzi1kV63Z1EY15+K9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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