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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9cb0511986017f58aa79e39e31839143707d65d721f6aa191ec51b82525301' 
  AND token = 'vWB3BYgcbAmR1bg6gv06JxjUFE7yjnWvzXAw9t/ek8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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