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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccce80abb6ece6f68b7bbcfe16020f1aa4ea53bec4e3da51984ae7e0d232a4f2' 
  AND token = 'gX8j244QHXZKdf2uexlw83DC09e9W/1WZbQOLtUlSoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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