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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc8d7579738ce5e0c354bc3fe640fac896e7da60fc4464590f23c89404a08bb' 
  AND token = 'JAH6QluSJYyFzV8WKTkno3Am6UDVn4+ahTgKTY/dsXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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