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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbbf74e141e46f974dee65b1af368883138aa48da1f8323d31f88d44bbdba73' 
  AND token = 'fD+cVXRug4OBFn6/7RjEkdriqqkusNgp2HmUkZIRaco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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