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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f89e09f757e009352a561b246cbfd0ed35e8683a74327a86e4819a85b30be0' 
  AND token = 't8B5OZSm4YQ8VH8/c8JnlotTbrArs74TDN5+/mPQiKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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