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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200ed77c258062b49cc7cb588f8ff7c48ab18cffc70c238a8b867514d182f5cf' 
  AND token = '4wZWdoKgvxIX/tAikUm2DxjIJ24Q2XYPSnfMkadQ2a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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