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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5936c70c964dc93a585997c8b939caf62c4f158eeed828e8d3bea2d45115c8e8' 
  AND token = 'XDKS9uxXHGMjFJQhnly3thsTM7m5hLituVMH/XViQCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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