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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56e25f3ba97faee8afea43d0606f36ba36d0d3cb31d7ebf2faff0d8ba39f6d1' 
  AND token = 'CkPxyQ1+WS0qPdCpFfNsQse/8j0Ll06rAf1RoD213N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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