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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cd3a5831ba127c75860457037bcd2ee0ccbdee45c78763e9055b0794833d6e' 
  AND token = 'OjAZTEg1VXfGZkXbO561mxyMCwbqm8BVzQGYZRsnM48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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