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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2f2ac117ec137295e757f7fe80faf1bed520b11059eef323c74e3a43c4165e' 
  AND token = 'LxWPdkb8UDYb01I0O9hpB0B0aIBaLxoeXflH6PFO4ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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