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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822ca264dcc3bcdd655fbacbe4f5d60530817313e1a4a0097ece5d9ccead9b7c' 
  AND token = 'jCjHek1xa08urDSQWXEPum1adShpxcbCtQEZIbJ+Kjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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