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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9baaf154ae65d88a2d369e92437f3d18792a3d3e69ba44563084363fc89f12a8' 
  AND token = 'UKcRZc2x2Aa3hR8Od9e95YN2Q2LoBboTSo9mVIpfPDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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