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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1589c2119cc553cf76729ec3bd0bc9c2ba28cea343a3daa42b13f2c8ecd293' 
  AND token = 'yUfBgixPBcq90FNKVw4AMxrW0pxAJ1r92KSVkvPwiMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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