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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e1ea7c1abdcf77ba1e8699f536cea28f56ba88e16991fcce4fff41aa651788' 
  AND token = 'YmTyq+79kSiG42Flz32jmOM0gAfT8FHInFeE1kK/ZZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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