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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0e40cd56982eaef99f8a630979e4895ec077521341c0932334d7060bf9f63e' 
  AND token = 'SUpkyz/KeTH5XQnGD0HNuG9RtKN/yOv5sPSQ+cLt+8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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